Update typespec of drop to allow negative integer (#8614)
Update typespec of drop to allow negative integer (#8614)

Drop allows negative integers for dropping from the end.
kelvinst/elixir,lexmag/elixir,kimshrier/elixir,kelvinst/elixir,pedrosnk/elixir,elixir-lang/elixir,lexmag/elixir,ggcampinho/elixir,pedrosnk/elixir,kimshrier/elixir,michalmuskala/elixir,ggcampinho/elixir,joshprice/elixir